Journal
NANO-MICRO LETTERS
Volume 9, Issue 4, Pages -Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-017-0147-3
Keywords
Fe@Fe3O4; Nanosheet arrays; Fe wire; One-dimensional; Wire-shaped supercapacitor (WSSC)
Funding
- Zhujiang New Stars of Science and Technology [2014J2200061]
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One-dimensional (1D, wire-and fiber-shaped) supercapacitors have recently attracted interest due to their roll-up, micrometer size and potential applications in portable or wearable electronics. Herein, a 1D wire-shaped electrode was developed based on Fe3O4 nanosheet arrays connected on the Fe wire, which was prepared via oxidation of Fe wire in 0.1 M KCl solution (pH 3) with O-2-rich environment under 70 degrees C. The obtained Fe3O4 nanosheet arrays displayed a high specific capacitance (20.8 mF cm(-1) at 10 mV s(-1)) and long cycling lifespan (91.7% retention after 2500 cycles). The excellent performance may attribute to the connected nanosheet structure with abundant open spaces and the intimate contact between the Fe3O4 and iron substrate. In addition, a wire-shaped asymmetric supercapacitor was fabricated and had excellent capacitive properties with a high energy density (9 lWh cm(-2)) at power density of 532.7 mu W cm(-2) and remarkable long-term cycling performance (99% capacitance retention after 2000 cycles). Considering low cost and earth-abundant electrode material, as well as outstanding electrochemical properties, the assembled supercapacitor will possess enormous potential for practical applications in portable electronic device.
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